[PATCH 3/3] common/sfc_efx/base: fix reading advertised autoneg ability

[Ivan Malov <ivan.malov@arknetworks.am>]

The issue is that when the user disables auto-negotiation by removing
the capability bit from the 'advertised mask' (set method) and then
reads the resulting capabilities, which involves querying MCDI, the
bit reappears in the mask irrespective of the user's intent.

Fix this by remembering the user's intent before any link-state queries.

Fixes: 2a5cf77e6de8 ("common/sfc_efx/base: provide PHY link get method on Medford4")
Fixes: 06f569de6c06 ("common/sfc_efx/base: decode netport link state on probe path")
Cc: stable@dpdk.org

Suggested-by: Andy Moreton <andy.moreton@amd.com>
Signed-off-by: Ivan Malov <ivan.malov@arknetworks.am>
Reviewed-by: Viacheslav Galaktionov <viacheslav.galaktionov@arknetworks.am>
Reviewed-by: Andy Moreton <andy.moreton@amd.com>
---
 drivers/common/sfc_efx/base/efx_np.c       | 11 +++++------
 drivers/common/sfc_efx/base/medford4_phy.c |  6 +++++-
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/common/sfc_efx/base/efx_np.c b/drivers/common/sfc_efx/base/efx_np.c
index 4ba3c7d260..a8396535bf 100644
--- a/drivers/common/sfc_efx/base/efx_np.c
+++ b/drivers/common/sfc_efx/base/efx_np.c
@@ -436,9 +436,6 @@ efx_np_link_state(
 	    MCDI_OUT2(req, const uint8_t, LINK_STATE_OUT_ADVERTISED_ABILITIES),
 	    &lsp->enls_adv_cap_mask);
 
-	if (lsp->enls_an_supported != B_FALSE)
-		lsp->enls_adv_cap_mask |= 1U << EFX_PHY_CAP_AN;
-
 	efx_np_cap_hw_data_to_sw_mask(
 	    MCDI_OUT2(req, const uint8_t,
 		    LINK_STATE_OUT_LINK_PARTNER_ABILITIES),
@@ -1020,11 +1017,13 @@ efx_np_attach(
 	if (rc != 0)
 		goto fail3;
 
-	if (ls.enls_an_supported != B_FALSE)
-		epp->ep_phy_cap_mask |= 1U << EFX_PHY_CAP_AN;
-
 	epp->ep_adv_cap_mask = ls.enls_adv_cap_mask;
 
+	if (ls.enls_an_supported != B_FALSE) {
+		epp->ep_adv_cap_mask |= 1U << EFX_PHY_CAP_AN;
+		epp->ep_phy_cap_mask |= 1U << EFX_PHY_CAP_AN;
+	}
+
 #if EFSYS_OPT_LOOPBACK
 	efx_np_assign_loopback_props(enp);
 #endif /* EFSYS_OPT_LOOPBACK */
diff --git a/drivers/common/sfc_efx/base/medford4_phy.c b/drivers/common/sfc_efx/base/medford4_phy.c
index 7b456c9b8a..4d2a954d4f 100644
--- a/drivers/common/sfc_efx/base/medford4_phy.c
+++ b/drivers/common/sfc_efx/base/medford4_phy.c
@@ -32,15 +32,19 @@ medford4_phy_get_link(
 	__out		ef10_link_state_t *elsp)
 {
 	efx_np_handle_t nph = enp->en_port.ep_np_handle;
+	const efx_port_t *port = &enp->en_port;
 	efx_np_link_state_t ls;
 	efx_np_mac_state_t ms;
+	uint32_t preserve_an;
 	efx_rc_t rc;
 
+	preserve_an = port->ep_adv_cap_mask & (1U << EFX_PHY_CAP_AN);
+
 	rc = efx_np_link_state(enp, nph, &ls);
 	if (rc != 0)
 		goto fail1;
 
-	elsp->epls.epls_adv_cap_mask = ls.enls_adv_cap_mask;
+	elsp->epls.epls_adv_cap_mask = ls.enls_adv_cap_mask | preserve_an;
 	elsp->epls.epls_lp_cap_mask = ls.enls_lp_cap_mask;
 	elsp->epls.epls_lane_count = ls.enls_lane_count;
 	elsp->els_loopback = ls.enls_loopback;
-- 
2.47.3